Oxygen detectors



FIG. 1 is a perspective elevation view of an oxygen detector accordingto my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

I claim the ornamental design for an oxygen detector, as shown.